larson



D. C. LARSON.

REVERSE PHASE RELAY.

APPLICATlON FILED JUNE 2351911.

' Patnt'ed J uly 15, 1919.

BSHEETS-SHEET I N a x &

BY Lf ATTORNEY D. C. LARSON.

REVERSE PHASE RELAY.

APPLICATION HLED JUNE 23. 1917.

PatentedJu1y15,1919.

3 SHEETS SHEET 2.

' INVENTOR WITNESSES ATTORNEY DEC. LARSON.

REVERSE PHASE RELAY APPLICATION FILED JUNE 23, $917. 1,809,642. EPatented July 15, 1919.

3 SHEETS-SHEET 3 UNITED STATES PATENT DAVID C. LARSON, F YONKERS, NEWYORK, A$SIGNOR T8 QTYIS ELEVATSR COMFANY, 0F JERSEY CITY, NEW JERSEY, ACORPORATION 61: NEW J'EPtivEY.

REVEfEhSB-PHASE Application filed June 23,

To all whom it may com-em Be it known that 1, Dawn C. Lanson, a citizenoi. the United States, residing at Yonkers, in the county ofWestchesterand State of New York, have invented a new and usefulImprovement in Reverse-Phase Relays, of which the following is aspecification.

My invention relates to improvements in 10 reverse phase relays, inwhich clectro-ningnets are employed to attract a suitably poised movablearmature, carrying a contact, which may constitute one of the contactsin the circuit of a supply or receiving; apparatus; the

relay may be described in brief as a reverse )hase elcctro-mamieticautomatic circuit a H r: i breaker. It \Vlll, provide protect on aga nstphase reversal, low voltage or the opening oi one of the su J )l 1 linesto the receivi a.)-

2'0 paratus.

Among the objects of my improvement are, to provide a relay of the kindwhich may be used for either two or three phases; to design a relay in.which gravitational 2o forces are used to move the armature to re leaseor separate the contact from the other contact in the circuit oftherecci ing apparatus; to resort to the use of copper for the contactcarried by the armature of the'relay,

and to carbon for the contact in the circuit to the receiving apparatus,in other words, carbon to copper contact; to constitute a simpleapparatus, the parts .in which are readily accessible for inspection andobservation', cleaning, adjustment for wear or otherwise, repairing orrenewing, and in which the power consumed to operate the relay ispractically negligible.

I attain these objects by the apparatus 40 sh0wn in the accompanyingdrawings, in

which.

Figure 1 is a front or face View or? the relay, mounted on a slate orboard;

Fig. 2 is a side ViBW of Fig. 1, looking in the direction from left toright.

the relay applied between a three wire systern for two and threephaseaand a motor.

, Figli is a View similar to Fig. 3 showing the relay applied to a threewire system and connected 1n series with the'motor.

Specification of Letters Patent.

. screw,

latenied July '15, 919

Serial No, 1%,544.

Similar numerals refer to similar parts throughout the several news.

llpon a slate. H, I allix a haseiu? support,

legs. 5, of the cores, 3, ll har placed spools I or windings, (S and T;and connected the end or terminal, 8, of one oil? the spools, 6, to abinding post, A, E i 1, and the other end or terminal, 9. iii the spool,(5, to another binding post, ii, and the end or te'rininal, 10, oi theother spool or winding, 7, to still another hiiuling post, t, l ig. l,and the other end or terminal, ll, of the spool '7, to a :t'mu-thbinding-g post, the four posts being mounted on the slate, 55. At oneend, 12, of the base or support, 2,-in this instance, the lower end, asi. have shownthe support, 2, placed Vertically-ll provide bearings forjournals,which I will now describe more particularl The lower end. ofthe support, 2, is brought outwardly at a right angle from the verticalpart of the base to form a part, 13, in which l have formed journalbearings, 11' conunsised of two set screws, 15., having a'slit or iii,136, for the entrance of a screw driver and the other end a bearing toreceive the ends or a journal, 17. The journal supports an armature forthe-electromagocts 'eonu'irised of the cores, 8 and windings (3 and i.l. have shown the armature as a stri of aluminum, 1.8, in the shape ofported by rods, 19, fast at their upperends to the segment, 18, and'atthei r lower ends to proiectiou. or lug, 5 50, that is fast on thejournal, 1'2, by means of a washer, 21, and a 9 screwed into the lug,20, and se v ing to bind the W2 sher, 21, the lower ends of the rods,19, and the luv 20 ti ht to ether.

Thelug 2O fast on the journal 1?. I have,

secured to the journal, 1'7, a weight or mass,

23, extended from the under side of the our-H no}, i, and to one side ofits longitudinal axis or center, the effect of the weight 23, ctingdownward, tliirough the journal, 17, is to constrain. by grav'itationalforce thev journal, 1'3, to turn about its horizontal axis,

and thereby tend to more the armature, 18,

to one side a perpendicular line dra n through the vertical middle ofthejournal .tacts, Q6 and 29, from each other.

and the armature. On the side of the jourrail, 17, opposite to thedirection of the projection of the weight, 23, l have formed a lug inthe shape of a ring". '24, projected from the lug 20 in which I havesecured the holder, 25, ot'a copper contact, an. and

joined the terminal. 27, ot' the holder, 25, lo a binding post, E. by aconductor w re, 28. The contact, cooperating with the copper contact,26, is a carbon contact, 2 and is held in a contact holder 50.screw-thrcaded into a lug, 3t, secured to the slate, by a binding post,F. The weight of the copper contact holder, 25, prepondcratcs the weightof'the projection, 23, and serves to turn the journal, 17, on its axisand separate the con- It will he observed that according to the designof my relay, the armature, 18, is placed above or one side of theelectro-niagncts. and the pivotal point or journal of the aru'iature andthe contacts on the other side of the electroinagnets, by whicharrangement I am eliabled to devise not only a compact relay. but one inwhich there shall he certainty of operation and a minimum innnher ot'movin 2' parts, all oi which go to make a more perfected, desirable andreliable relay in actual service conditions. These contacts may be putin the circuit of any receiving or supply' apparatus.

In the Fig. 3, I have shown the plied to a two phase, i'our tern, inwhich the binding posts, A, it, D, are connected to the four wires, 1,:3, 3, 4, of the supply system; and the binding posts, E and l, areconnected in the wire, 1, of the four wires of the supply system by alead, 32, and to a solenoid winding, 325, in a lead, 3%, to the wire, 2,ol the tour wires of the supply system. The solenoid Winding, incloses asolenoid core, 235, which serves to open and close a switch in thecircuits constituted of the tour wires, 1, 2, 3, 4, to a motor, M.

In Fig. 4, I have shown the relay applied to a three wire system for twoand three phases; the arrangement in applying the relay apwire supplsysrelay is practically the same as that described and shown in Fig.tion to a four wire system, except that there being only three wires.the ends or terminals, 8 and 10, oi the spools, l3 and T. are joined toa common hindin; post, (i, from which is a lead, an, to the supply wire.2. of the three wires, 1, 2. ii, of the three wire supply system.

In Fig. 5, the relay winding-l3 is coninclcil 3 for its applicain serieswith one of he phascs ol' the stator, and winding T is connected inscrws with another phase of lhe suitor. .\n clcct].'0lil2i;fli0l ic mainline switch. S. is provided to connectand disconnect the motor .\l withthe supply wires 1. Qand 1%. A push button, 37,,Opcratcs to close acircuit for the. winding the relay works in the. wrong direction 38 ofthe main line switch, the relay contacts, 2h and 2 conlrollin; ascll-holdiugr circuit for [he said winding. An additional push button.25!). is includcd in series with the winding. 38, in therircuilsthcrcl'or controlled by the push button, 3T, and relay contacts. ii and'11 I The operation ol' the relay is obvious from the foregoingdescription. of ll cons! ruclion and application, but it may he briellystated that. upon the encrgizaliou ol' the clcclrO- magnet, and thephases being in the desired direction, the armature, In, is moved in thedirection suitable to close the contacts. 2i; and 2!), and thesolenohl-opcrated switch in the supply circuit to the motor. M, will heltept closed. Subsequently, it something should go wrong, as forinstance. one of the supply lines, l, I}. or 1, 2, 1i, 4, being opened,one of the windings or spools, (i or 7, will be opcn-circuitial, aiulthe other winding will not be strong enough to hold the armature, l8,attracted against the force of the weight in the holder, 2?. ol' thecopper contact, 26, lending to turn the journal, 17. on its axis, andseparate the contacts, 243 and 2t), and opcu-circuil thesolcnoid-winding. 33, and allow the solenoid core to drop and cause thesupply circuit to the motor, M, to he opened. ()l' course, as has beenstated, the contacts, 2 3 and it), may he used to close a circuit to anyother desired devicc than to a solenoid. and so on. In case of areversal ol the phase. the armature, 18, will move in a directi n toturn the journal, '17, on its axis. and the contact an. away from theconta t 25 and open the circuit to the solenoid, and the supply circuitto the motor. In case of excessively low voltage, gravitatioual forcewill again prcpondcralc over the force, ol' the elcclro'inaguclicattraction of tho armature, 1H, and the supply circuit will be opened.

lhc series type of reverse phase relay illustrated in Fig. 5, alloi'dsadditional protecliou o\'c1' the shunt type relay, in that it operatesto dis onnect the motor l'roni its supply source it a phase in the motoritsell' opens. or it a phase in the line supply opens while the motor isrunning.

it upon applyin the relay ii is found that to accomplish the purpose olits desired use, the leads to the posts, A and ll, or (7 and I). shouldbe reversed, as is well understood.

1 have described the relay more or less particularly, but it isunderstood. of course, that l do not intend to limit my invention toparticulars. but I desire that it shall include all aml everything thatis within the spirit ol' my invention.

What 1 desire to claim is in an allcrnat-in current relay, thecomhinalion ot a pair of clcclro-magncts, substant iall y U-shapcd corestherefor, the cores Hit) ill)

10 jecting weights serving to accelerate set apart and slightlydivergent from each other, an armature inthe gap between the cores, ajournal for the armature, at the opposite 1- other endfpf the magnets,the journ'al having a wegh't' projecting frolnone side thereof adaptedto turn the armature t one side of its pivot in an inoperated, positionand a contact projecting from the op posite side of the journal; the twoprothe movement of the armature, it being turned to one side of itsjournal, and adapted to contact with another contact in operation.

In testimony whereof, I have signed my name to this specification in thepresence of 15 two subscribing witnesses.

DAVID C. LARSON. Witnesses:

VIERNEST L. GALE, Jr.

HAZEL R. GATES.

